The decision of whether or not to reveal one's face is deeply personal. In the case of Ironmouse, she has chosen to keep her face a secret. This decision is likely motivated by a desire for privacy, a wish to avoid harassment, and a belief that it helps her to maintain her mystique. Whatever her reasons, Ironmouse's decision should be respected.
It is important to remember that public figures are also human beings. They deserve to have their privacy respected, just like anyone else. When we speculate about their personal lives or pressure them to reveal their faces, we are crossing a line. We should instead focus on supporting them and their work.